A Southwest Airlines flight attendant allegedly was assaulted by a passenger during a flight and lost several teeth, according to the president of the Southwest Airlines flight attendants’ union. TWU Local 556 President Lyn Montgomery said that over the past weekend, “one of our flight attendants was seriously assaulted, resulting in injuries to the face and a loss of two teeth.” She issued the letter in a bid to highlight misconduct incidents that have occurred on Southwest flights over the past several months. “I write to you today because we cannot tolerate our beloved cohearts (sic) being abused in such a manner, and because I am asking for your help and leadership in ending these travesties,” her letter stated. “One tool to better utilize would be the Southwest Airlines restricted travelers list,” it added. “The flying public needs to understand that egregious behavior will result in being banned from flying with …